Delayed oral toxicity from long term Vemurafenib therapy

We read with interest the article by Vigarios et al.1 describing eight patients treated with a variety of BRAF inhibitors who developed asymptomatic hyperkeratotic oral mucosal lesions. These were frequently multifocal and presented following a mean onset of three months of treatment with a BRAF inhibitor. In one patient, one such lesion rapidly developed into oral squamous cell carcinoma requiring excision. We would like to highlight delayed oral toxicity in a long-term responder to a BRAF inhibitor.